In this article, you will find information about the fuses of the GMC Sierra (GMT800) (1999, 2000, 2001, and 2002), including diagrams of the fuse boxes, a list of fuses and relays, their designation, and the location of the fuse blocks within the vehicle.
Checking and Replacing Fuses in GMC Sierra The wiring circuits in your vehicle are protected from short circuits by a combination of fuses, circuit breakers and fusible thermal links. This greatly reduces the chance of fires caused by electrical problems. Look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. If you ever have a problem on the road and don’t have a spare fuse, you can borrow one that has the same amperage.
You can remove fuses with a fuse extractor. The fuse extractor is mounted to the fuse block access door. Caution!
Don’t add anything electrical to your vehicle unless you check with your dealer first. Some add-on electrical equipment can keep other components from working as they should. Be sure you replace a bad fuse with a new one of the identical size and rating. Location of Fuse BoxesInstrument Panel Fuse Block: The fuse block access door is on the driver’s side edge of the instrument panel. Pull off the cover to access the fuse block.
Center Instrument Panel Utility Block: The center instrument panel utility block is located underneath the instrument panel, to the left of the steering column.
Underhood Electrical Center: The underhood electrical center is located on the driver’s side of the engine compartment near the battery. Lift the cover for access to the fuse/relay block.
The windshield wiper motor is protected by an internal circuit breaker and a fuse. If the motor overheats due to heavy snow, etc., the wiper will stop until the motor cools.
Fuse Box Diagrams 1999Instrument Panel Fuse Block
List of fuses in the Instrument Panel Fuse Block (1999) NAME Usage L BODY Retained Accessory Power Relay LOCK Power Door Locks DRV UNLOCK Power Door Lock Relay LOCK Power Door Lock Relay HVAC 1 Climate Control System CRUISE Cruise Control, Instrument Cluster IGN 3 Ignition, Power Seats 4WD Four-Wheel Drive System, Auxiliary Battery CRANK Starting System INT PRK Parking Lamps, Sidemarker Lamps, Interior Lamps L DOOR Power Door Lock Relay BRAKE Anti-Lock Brake System RR WIPER Not Used ILLUM Interior Lamps SEAT Power Seat Circuit Breaker TURN Exterior Lamps, Turn Signals, Hazard Lamps UNLOCK Power Door Locks HTR A/C Climate Control System WS WPR Windshield Wipers IGN 1 Ignition, Instrument Panel AIR BAG Air Bag MIR/LOCK Power Mirrors, Power Door Locks DR LOCK Power Door Locks PWR WDO Power Window Circuit Breaker UNLOCK Power Door Lock Relay IGN 0 PRND321 Display, Odometer, VCM/PCM SEO IGN Special Equipment Option, Ignition, Manual Selectable Ride SEO ACCY Special Equipment Option Accessory, Cellular Telephone RAP #1 Retained Accessory Power Relay RDO 1 Audio System RAP #2 Not Used
Center Instrument Panel Utility Block
List of fuses in the Center Instrument Panel Utility Block (1999) Relay Name Usage SEO Special Equipment Option HTD ST Heated Scats SPARE 4 Not Used VANITY Headliner Wiring TRAILER Trailer Brake Wiring PWR ST Power Seats SPARE 5 Not Used CLUTCH Manual Transmission Clutch Switch UPF Upfittcr PARK LAMP Parking Lamps FRT PRK EXPT Not Used SL RIDE Manual Selectable Ride Switch SPARE 2 Not Used RR PRK LP Not Used RR FOG LP Not Used SPARE 3 Not Used INAV PWR Interior Lights Feed CTSY LP Courtesy Lamps CEL PHONE Cellular Telephone Wiring
Underhood Electrical Center
List of fuses in the Underhood Electrical Center (1999) Name Usage STUD #1 Accessory Power / Trailer Wiring Feed ABS Anti-Lock Brakes IGN A Ignition Switch AIR A.I.R. System RAP #1 Retained Accessory Power, Power Mirrors, Power Door Locks, Power Seat(s) IGN B Ignition Switch RAP #2 Not Used STUD #2 Accessory Power / Trailer Wiring Brake Feed TRL R TRN Right Turn Signal Trailer Wiring TRL L TRN Left Turn Signal Trailer Wiring IGN 1 Ignition, Fuel Controls INJ B Ignition, Fuel Controls (Relay) STARTER Starter (Relay) PARK LP Parking Lamps FRT HVAC Climate Control System STOP LP Exterior Lamps, Stoplamps ECM 1 VCM/PCM CHMSL Center High Mounted Stoplamp VEH STOP Stoplamps, Cruise Control TRL B/U Backup Lamps Trailer Wiring INJ A Fuel Controls, Ignition RR HVAC Not Used VEH B/U Vehicle Backup Lamps ENG 1 Engine Controls, Canister Purge, Fuel System ETC Electronic Throttle Control IGN E A/C Compressor Relay, Rear Window Dcfogger, Daytime Running Lamps, A.I.R. System B/U LP Backup Lamps, BTSI ATC Automatic Transfer Case RR DEFOG Rear Window Dcfogger, Heated Mirrors (Relay) RR PRK Right Rear Parking Lamps ECM B VCM/PCM F/PMP Fuel Pump (Relay) O2 A Oxygen Sensors O2 B Oxygen Sensors LR PRK Left Rear Parking Lamps RR DEFOG Rear Window Dcfogger, Heated Mirrors HDLP Headlamps (Relay) TRL PRK Parking Lamps Trailer Wiring RT HDLP Right Headlamps DRL Daytime Running Lamps (Relay) HTD MIR Heated Mirrors LT HDLP Left Headlamps A/C Air Conditioning AUX PWR Cigarette Lighter, Auxiliary Power Outlets SEO 2 Special Equipment Option Power, Power Seats, Aux Roof Mnt Lamp SEO 1 Special Equipment Option Power, Aux Roof Mnt Lamp, Cell Phone DRL Daytime Running Lamps A/C A/C (Relay) FOG LP Fog Lamps FOG LP Fog Lamps (Relay) RADIO Audio System, Instrument Cluster, Climate Control System CIGAR Cigarette Lighter, Auxiliary Power Outlets RT TURN Right Turn Signals BTSI Brake-Transmission Shift Interlock LT TURN Left Turn Signals FR PRK Front Parking Lamps, Sidcmarker Lamps W/W PMP Windshield Washer Pump HORN Horn (Relay) IGN C Ignition Switch, Fuel Pump, PRND321 Display, Crank RDO AMP Not Used HAZ LP Exterior Lamps, Hazard Lamps EXP LPS Not Used HORN Horn CTSY LP Interior Lamps RR WPR Not Used TBC Body Control Module, Remote Keyless Entry, Headlamps
2000Instrument Panel Fuse Block
List of fuses in the Instrument Panel Fuse Block (2000) NAME Usage L BODY Retained Accessory Power Relay LOCK Power Door Locks DRV UNLOCK Power Door Lock Relay LOCK Power Door Lock Relay HVAC 1 Climate Control System CRUISE Cruise Control, Instrument Cluster IGN 3 Ignition, Power Seats 4WD Four-Wheel Drive System, Auxiliary Battery CRANK Starting System INT PRK Parking Lamps, Sidemarker Lamps, Interior Lamps L DOOR Power Door Lock Relay BRAKE Anti-Lock Brake System RR WIPER Not Used ILLUM Interior Lamps SEAT Power Seat Circuit Breaker TURN Exterior Lamps, Turn Signals, Hazard Lamps UNLOCK Power Door Locks HTR A/C Climate Control System WS WPR Windshield Wipers IGN 1 Ignition, Instrument Panel AIR BAG Air Bag MIR/LOCK Power Mirrors, Power Door Locks DR LOCK Power Door Locks PWR WDO Power Window Circuit Breaker UNLOCK Power Door Lock Relay IGN 0 PRND321 Display, Odometer, VCM/PCM SEO IGN Special Equipment Option, Ignition, Manual Selectable Ride SEO ACCY Special Equipment Option Accessory, Cellular Telephone RAP #1 Retained Accessory Power Relay RDO 1 Audio System RAP #2 Not Used
Center Instrument Panel Utility Block
List of fuses in the Center Instrument Panel Utility Block (2000) Relay Name Usage SEO Special Equipment Option HTD ST Heated Seats SPARE 4 Not Used VANITY Headliner Wiring TRAILER Trailer Brake Wiring PWR ST Power Seats SPARE 5 Not Used CLUTCH Manual Transmission Clutch Switch UPF Upfitter PARK LAMP Parking Lamps FRT PRK EXPT Not Used SL RIDE Manual Selectable Ride Switch SPARE 2 Not Used RR PRK LP Not Used RR FOG LP Not Used SPARE 3 Not Used INAV PWR Interior Lights Feed CTSY LP Courtesy Lamps CEL PHONE Cellular Telephone Wiring
Underhood Electrical Center
List of fuses in the Underhood Electrical Center (2000) Name Usage STUD #1 Accessory Power / Trailer Wiring Feed ABS Anti-Lock Brakes IGN A Ignition Switch AIR A.I.R. System RAP #1 Retained Accessory Power, Power Mirrors, Power Door Locks, Power Seat(s) IGN B Ignition Switch RAP #2 Not Used STUD #2 Accessory Power / Trailer Wiring Brake Feed TRL R TRN Right Turn Signal Trailer Wiring TRL L TRN Left Turn Signal Trailer Wiring IGN 1 Ignition, Fuel Controls INJ B Ignition, Fuel Controls (Relay) STARTER Starter (Relay) PARK LP Parking Lamps FRT HVAC Climate Control System STOP LP Exterior Lamps, Stoplamps ECM 1 VCM/PCM CHMSL Center High Mounted Stoplamp VEH STOP Stoplamps, Cruise Control TRL B/U Backup Lamps Trailer Wiring INJ A Fuel Controls, Ignition RR HVAC Not Used VEH B/U Vehicle Backup Lamps ENG 1 Engine Controls, Canister Purge, Fuel System ETC Electronic Throttle Control IGN E AJC Compressor Relay, Rear Window Defogger, Daytime Running Lamps, A.I.R. SystemB/U LP Backup Lamps, Automatic Transmission Shift Lock Control System ATC Automatic Transfer Case RR DEFOG Rear Window Defogger, Heated Mirrors (Relay) RR PRK Right Rear Parking Lamps ECMB VCM/PCM F/PMP Fuel Pump (Relay) O2 A Oxygen Sensors O2 B Oxygen Sensors LR PRK Left Rear Parking Lamps RR DEFOG Rear Window Defogger, Heated Mirrors HDLP Headlamps (Relay) TRL PRK Parking Lamps Trailer Wiring RT HDLP Right Headlamps DRL Daytime Running Lamps (Relay) HTD MIR Heated Mirrors LT HDLP Left Headlamps A/C Air Conditioning AUX PWR Cigarette Lighter, Auxiliary Power Outlets SEO 2 Special Equipment Option Power, Power Seats, Aux Roof Mnt Lamp SEO 1 Special Equipment Option Power, Aux Roof Mnt Lamp, Cell Phone DRL Daytime Running Lamps A/C A/C (Relay) FOG LP Fog Lamps FOG LP Fog Lamps (Relay) RADIO Audio System, Instrument Cluster, Climate Control System CIGAR Cigarette Lighter, Auxiliary Power Outlets RT TURN Right Turn Signals BTSI Automatic Transmission Shift, Lock Control System LT TURN Left Turn Signals FR PRK Front Parking Lamps, Sidemarker Lamps W/W PMP Windshield Washer Pump HORN Horn (Relay) IGN C Ignition Switch, Fuel Pump, PRND321 Display, Crank RDO AMP Not Used HAZ LP Exterior Lamps, Hazard Lamps EXP LPS Not Used Horn Horn CTSY LP Interior Lamps RR WPR Not Used TBC Body Control Module, Remote Keyless Entry, Headlamps
2001Instrument Panel Fuse Block
List of fuses in the Instrument Panel Fuse Block (2001) NAME Usage L BODY Retained Accessory Power Relay LOCK Power Door Locks DRV UNLOCK Power Door Lock Relay LOCK Power Door Lock Relay HVAC 1 Climate Control System CRUISE Cruise Control, Instrument Panel Cluster IGN 3 Ignition, Power Seats 4WD Four-Wheel Drive System, Auxiliary Battery CRANK Starting System INT PRK Parking Lamps, Sidemarker Lamps, Interior Lamps L DOOR Power Door Lock Relay BRAKE Anti-Lock Brake System RR WIPER Not Used ILLUM Interior Lamps SEAT Power Seat Circuit Breaker TURN Exterior Lamps, Turn Signals, Hazard Lamps UNLOCK Power Door Locks HTRA/C Climate Control System WS WPR Windshield Wipers IGN 1 Ignition, Instrument Panel AIR BAG Air Bag MIR/LOCK Power Mirrors, Power Door Locks DR LOCK Power Door Locks PWR WDO Power Window Circuit Breaker UNLOCK Power Door Lock Relay IGN 0 PRND321 Display, Odometer, PCM SEO IGN Special Equipment Option, Ignition, Manual Selectable Ride SEO ACCY Special Equipment Option Accessory, Cellular Telephone RAP #1 Retained Accessory Power Relay RDO 1 Audio System RAP #2 Not Used
Center Instrument Panel Utility Block
List of fuses in the Center Instrument Panel Utility Block (2001) Name Usage SEO Special Equipment Option HTD ST Heated Seats SPARE 4 Not Used VANITY Headliner Wiring TRAILER Trailer Brake Wiring PWR ST Power Seats SPARE 5 Not Used CLUTCH Manual Transmission Clutch Switch UPF Upfitter PARK LAMP Parking Lamps (Relay) FRT PRK EXPT Not Used (Fuse) SL RIDE Manual Selectable Ride Switch SPARE 2 Not Used RR PRK LP Not Used (Relay) RR FOG LP Not Used (Relay) SPARE 3 Not Used INADV PWR Interior Lights Feed CTSY LP Courtesy Lamps CEL PHONE Cellular Telephone Wiring
Underhood Electrical Center
List of fuses in the Underhood Electrical Center (2001) Name Usage GLOW PLUG Diesel Glow Plugs and Intake Air Heater CUST FEED Gasoline Accessory Power STUD #1 Accessory Power / Trailer Wiring Feed ABS Anti-Lock Brakes IGN A Ignition Switch AIR A.I.R. System RAP #1 Power Mirrors, Power Door Locks, Power Seat(s) IGN B Ignition Switch RAP #2 Not Used STUD #2 Accessory Power / Trailer Wiring Brake Feed SPARE Spare Fuse TRL R TRN Right Turn Signal Trailer Wiring TRL L TRN Left Turn Signal Trailer Wiring IGN 1 Ignition, Fuel Controls (Relay) INJ B Ignition, Fuel Controls STARTER Starter (Relay) PARK LP Parking Lamps FRT HVAC Climate Control System STOP LP Exterior Lamps, Stoplamps ECM I PCM ECMRPV Fuel Controls, ECM CHMSL Center High Mounted Stoplamp VEH STOP Stoplamps, Cruise Control TRL B/U Backup Lamps Trailer Wiring INJ A Fuel Controls, Ignition RR HVAC Not Used VEH B/U Vehicle Backup Lamps ENG 1 Engine Controls, Canister Purge, Fuel System ETC Electronic Throttle Control IGN E A/C Compressor Relay, Rear Window Defogger, Daytime Running Lamps, A.I.R. System B/U LP Backup Lamps, Automatic Transmission Shift Lock Control System ATC Automatic Transfer Case RR DEFOG Rear Window Defogger, Heated Mirrors (Relay) RR PRK Right Rear Parking Lamps ECMB PCM F/PMP Fuel Pump (Relay) O2 A Oxygen Sensors FUEL HT Fuel Heater, Glow Plug and Intake Heater Controls O2 B Oxygen Sensors LR PRK Left Rear Parking Lamps RR DEFOG Rear Window Defogger, Heated Mirrors HDLP Headlamps (Relay) TRLPRK Parking Lamps Trailer Wiring RT HDLP Right Headlamps DRL Daytime Running Lamps (Relay) HTD MIR Heated Mirrors LT HDLP Left Headlamps A/C Air Conditioning AUX PWR Cigarette Lighter, Auxiliary Power Outlets SEO 2 Special Equipment Option Power, Power Seats, Aux Roof Mnt Lamp SEO 1 Special Equipment Option Power, Aux Roof Mnt Lamp, Cell Phone, OnStar DRL Daytime Running Lamps A/C A/C (Relay) FOG LP Fog Lamps FOG LP Fog Lamps (Relay) RADIO Audio System, Instrument Cluster, Climate Control System *1 INJ B-Gasoline Engine and Diesel Engine. *2 ECM I-Gasoline Engine; ECMRPV-Diesel Engine. *3 O2 A-Gasoline Engine; FUEL HT-Diesel Engine. *4 O2 B-Gasoline Engine; ECM I-Diesel Engine.
2002Instrument Panel Fuse Block
List of fuses in the Instrument Panel Fuse Block (2002) Fuse Usage L BODY Retained Accessory Power Relay LOCK Power Door Locks DRV UNLOCK Power Door Lock Relay LOCK Power Door Lock Relay HVAC 1 Climate Control System CRUISE Cruise Control, Instrument Panel Cluster IGN 3 Ignition, Power Seats 4WD Not Used CRANK Starting System INT PRK Interior Lamps L DOOR Power Door Lock Relay BRAKE Anti-Lock Brake System RR WIPER Not Used ILLUM Interior Lamps SEAT Power Seat Circuit Breaker TURN Exterior Lamps, Turn Signals, Hazard Lamps UNLOCK Power Door Locks HTR A/C Climate Control System WS WPR Windshield Wipers IGN 1 Ignition, Instrument Panel AIR BAG Air Bag MIR/LOCK Power Mirrors, Power Door Locks DR LOCK Power Door Locks PWR WDO Power Window Circuit Breaker UNLOCK Power Door Lock Relay IGN 0 PRND321 Display, Odometer, PCM SEO IGN Special Equipment Option, Ignition, Manual Selectable Ride SEO ACCY Special Equipment Option Accessory, Cellular Telephone RAP #1 Retained Accessory Power Relay RDO 1 Audio System RAP #2 Not Used
Center Instrument Panel Utility Block
List of fuses in the Center Instrument Panel Utility Block (2002) Fuse Name Usage SEO Special Equipment Option HTD ST Heated Seats SPARE Not Used VANITY Headliner Wiring TRAILER Trailer Brake Wiring PWR ST Power Seats SPARE Not Used UPF Upfitter PARK LAMP Parking Lamps FRTPRK EXPT* Not Used SPARE 2 Not Used PUDDLE LP Puddle Lamps SL RIDE Not Used SPARE 3 Not Used INADV PWR Interior Lamps Feed CTSY LP Courtesy Lamps CEL PHONE Cellular Telephone Wiring
Underhood Electrical Center
List of fuses in the Underhood Electrical Center (2002) Fuse Usage STUD #1 Accessory Power / Trailer Wiring Feed / Load Leveling ABS Anti-Lock Brakes IGN A Ignition Switch AIR A.I.R. System RAP #1 Retained Accessory Power, Power Mirrors, Power Door Locks, Power Seat(s) IGN B Ignition Switch RAP #2 Retained Accessory Power / Rear Power Windows, Sunroof, Radio STUD #2 Accessory Power / Trailer Wiring Brake Feed TRL R TRN Right Turn Signal Trailer Wiring TRL L TRN Left Turn Signal Trailer Wiring IGN 1 Ignition, Fuel Controls INJ B Ignition, Fuel Controls (Relay) STARTER Starter (Relay) PARK LP Parking Lamps FRT HVAC Climate Control System STOP LP Exterior Lamps, Stoplamps ECM 1 VCM/PCM CHMSL Center High Mounted Stoplamp VEH STOP Stoplamps, Cruise Control TRL B/U Backup Lamps Trailer Wiring INJ A Fuel Controls, Ignition RRHVAC Rear HVAC VEH B/U Vehicle Backup Lamps ENG 1 Engine Controls, Canister Purge, Fuel System ETC Electronic Throttle Control IGN E A/C Compressor Relay, Rear Window Defogger, Daytime Running Lamps, A.I.R. SystemB/U LP Backup Lamps, Automatic Transmission Shift Lock Control System ATC Automatic Transfer Case RR DEFOG Rear Window Defogger, Heated Mirrors (Relay) RTD Not Used RRPRK Passenger’s Side Parking Lamps ECMB VCM/PCM F/PMP Fuel Pump (Relay) O2 A Oxygen Sensors O2 B Oxygen Sensors LR PRK Driver’s Side Parking Lamps RR DEFOG Rear Window Defogger, Heated Mirrors HDLP Headlamps (Relay) TRL PRK Parking Lamps Trailer Wiring PRIME Not Used RT HDLP Passenger’s Side Headlamps DRL Daytime Running Lamps (Relay) HTD MIR Heated Mirrors LT HDLP Driver’s Side Headlamps A/C Air Conditioning AUX PWR Cigarette Lighter, Auxiliary Power Outlets SEO 2 Special Equipment Option Power, Power Seats, Aux Roof Mnt Lamp SEO 1 Special Equipment Option Power, Aux Roof Mnt Lamp DRL Daytime Running Lamps A/C A/C (Relay) FOG LP Fog Lamps FOG LP Fog Lamps (Relay) RADIO Audio System, Instrument Panel Cluster, Climate Control System